By soaking the big pacificsalmon(Oncorhynchus keta) skin in the alkali solution and then limit-digesting it in pepsin solution,the collagen was obtained.

• 用稀碱处理大马哈鱼皮,然后进行限制性酶解,制备得到胶原蛋白,检验制备样品的纯度,测定样品的热变性温度和细胞相容性。